PREHEAT oven to 375° F. Grease 13 x 9-inch baking dish.
BRING water to a boil in a large saucepan. Add rice; return water to a boil. Reduce heat to low; cover. Cook for 5 minutes. Remove from heat and fluff with fork. Add vegetables to rice; stir well. Spoon mixture into prepared dish.
MELT butter in medium, nonstick skillet over medium-high heat. Add onion; cook, stirring occasionally, for 3 to 4 minutes or until soft. Add flour, sugar, curry powder, salt and pepper. Cook, stirring constantly, for 30 seconds. Gradually stir in evaporated milk; bring mixture to a boil. Reduce heat to medium. Cook, stirring constantly, for 1 to 2 minutes or until sauce is slightly thickened. Pour sauce over rice mixture; gently stir well to combine. Cover tightly with foil.
BAKE for 20 to 25 minutes or until heated through. Remove from oven; fluff with fork.